package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.thymeleaf.ITemplateEngine;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.naming.*;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Resource
    private UserService userService;

    @Resource
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Resource
    private MailClient mailClient;

    @Resource
    private TemplateEngine templateEngine;

    @Resource
    private RedisTemplate redisTemplate;


    //跳转注册页面
    @RequestMapping(path = "/register",method = RequestMethod.GET)
    public String getRegisterPage(){
        return "/site/register";
    }

    //跳转登录页面
    @RequestMapping(path = "/login",method = RequestMethod.GET)
    public String getLoginPage(){
        return "/site/login";
    }

    //退出登录
    @RequestMapping(path = "/logout",method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket){
        userService.logout(ticket);
        return "redirect:/login";
    }

    //跳转忘记密码页面
    @RequestMapping(path = "/forget",method = RequestMethod.GET)
    public String getForgetPage(){
        return "/site/forget";
    }

    //注册提交,前后端交互
    @RequestMapping(path = "/register",method = RequestMethod.POST)
    public String register(Model model, User user){
        Map<String,Object> map = userService.register(user);
        if (map == null || map.isEmpty()){
            model.addAttribute("msg","注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target","/index");
            return "/site/operate-result";
        }else{
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            model.addAttribute("emailMsg",map.get("emailMsg"));
            return "/site/register";
        }
    }

    //激活用户
    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}",method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code){
        int result = userService.activation(userId,code);
        if(result == ACTIVATION_SUCCESS){
            model.addAttribute("msg","激活成功，您的账号已经可以使用！");
            model.addAttribute("target","/login");
        }else if (result == ACTIVATION_REPEAT){
            model.addAttribute("msg","无效操作，该账号已经被激活过了！");
            model.addAttribute("target","/index");
        }else{
            model.addAttribute("msg","激活失败，您提供的激活码不正确!");
            model.addAttribute("target","/index");
        }
        return "/site/operate-result";
    }


    //登录验证码
    @RequestMapping(path = "/kaptcha",method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response){
        //生成验证码
        String text = kaptchaProducer.createText();
        //放入图片中
        BufferedImage image = kaptchaProducer.createImage(text);

        //验证码的归属
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner",kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        //将验证码存入redis
        String kaptchaKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(kaptchaKey,text,60, TimeUnit.SECONDS);

        //将图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream outputStream = response.getOutputStream();
            ImageIO.write(image,"png",outputStream);
        } catch (IOException e) {
            logger.error("响应验证码失败:"+e.getMessage());
        }
    }

    //登录提交功能
    @RequestMapping(path = "/login",method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, /*HttpSession session, */HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner) {
        //检查验证码
        //String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)){
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        if(StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg","验证码不正确！");
            return "/site/login";
        }

        //检查账号，密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String,Object> map = userService.login(username,password,expiredSeconds);
        if (map.containsKey("ticket")){
            Cookie cookie = new Cookie("ticket",map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        }else {
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/login";
        }
    }

    //获取验证码
    @RequestMapping(path = "/forget/code",method = RequestMethod.GET)
    @ResponseBody
    public String getForgetCode(String email,HttpSession session){
        if (StringUtils.isBlank(email)){
            return CommunityUtil.getJSONString(1,"邮箱不能为空！");
        }

        //发送邮件
        Context context = new Context();
        context.setVariable("email",email);
        String code = CommunityUtil.generateUUID().substring(0,4);
        context.setVariable("verifyCode",code);
        String content = templateEngine.process("/mail/forget",context);
        mailClient.sendMail(email,"找回密码",content);

        //保存验证码
        session.setAttribute("verifyCode",code);
        return CommunityUtil.getJSONString(0);
    }

    //重置密码
    @RequestMapping(path = "/forget/password",method = RequestMethod.POST)
    public String resetPassword(String email,String verifyCode,String password,
                                Model model,HttpSession session){
        String code = (String) session.getAttribute("verifyCode");
        if (StringUtils.isBlank(verifyCode) || StringUtils.isBlank(code) || !code.equalsIgnoreCase(verifyCode)){
            model.addAttribute("codeMsg","验证码错误！");
            return "/site/forget";
        }
        Map<String,Object> map = userService.resetPassword(email,password);
        if (map.containsKey("user")){
            return "redirect:/login";
        }else{
            model.addAttribute("emailMsg",map.get("emailMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/forget";
        }
    }

}
